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RSTP Convergence Variability

Hi,

I'm trying to find out some information about the factors which influence RSTP convergence times. For example, given two (more or less) identical topologies why would spanning tree sometimes converge quickly (<1s) and other times slowly (1-5s).

I would imagine switch CPU, link bandwidth, and such like *may* affect convergence times (I even read that number of vlans is a factor) but has anyone done any testing in this area that they could share?

thanks,

Andrew.

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